Piston pump for medical purposes



July 5, 1932. c. MAYER PISTON PUMP FOR MEDICAL PURPOSES Filed April 22.1929 l l 1 l l l l l n .J

Patented July 5, k1932 CHARLES MAYER, or :PARISQFRANCE PIs'roN PUMP For.MEDIQATJ vPUnrosns Application sled April 22, 1929, serial No;`357,'2`75",'.f.p1a in france April 3o, 192s.

The present invention has reference to a piston pump for medicalpurposes of the valveless type and as its object embraces the provisionof a pump of the above character' wherein improved operating means ispro-` vided for imparting to the piston a continuous rotary andreciprocatory movement.

Briefly stated the invention may be said to consist in the provision ofa crank directly connected with the piston for effecting rotationthereof and provided with a finger movable in a cam slot which is fixedrelatively to the pump barrel for simultaneously impart-- ing to thepiston reciprocatory movement.

The invention also embraces the provision of a piston pump of the abovecharacter wherein the parts are constructed so that they may be rapidlyassembled and taken apart with a view of sterilizing the elements.

Other objects as well as the nature, characteristic features and scopeof the invention will be more readily apparent from the followingdescription taken in connection with-A the drawing and pointed out inthe claims forming a part of this specification.

The accompanying drawing illustrates, by way of example only, a medicalpump constructed in accordance with the invention, and in which :fp

Figure 1 is a vertical longitudinal section of the pump in its entirety.

Figure 2 is a partial section of the pump barrel, made through a planeat right angles to Figure 1 showing the suction and delivery ports.

Figures 3 and 4: are diagrammatic views showing the cycle of operationof the pump.

Referring more particularly to the accompanying drawing in which similarcharacters of reference designate corresponding parts throughout theseveral views there is provided a pump barrel in the form of a glasscylinder or tube 1 perfectly calibrated internally and on the upper partof which fits the bottom 2 of a metal armature extending down to thelower edge of the tube 1 so as to constitute a socket 3 screw-threadedat 4. The armature is provided with arms 5 and with perforated bosses 6and 7 which constitute 50 nozzles on which are secured the suction andand of small dimensions.

delivery pipesy (not shownin the drawing). The passage-ways YofV thenozzles coincide with orifices or ports 8 v and 9 provided through thewall 4ofthe tube 1. The armature' isV sealed on the glass by anysuitable cement resistant to a prolonged stay in boiling water or insterilizing stoves-"as well as to the attack of the differentantiseptics.

The piston comprises' a cylindrical metal body 10 thelength of which is,as that of the pump barrel, important relatively to 4the stroke, forthevdouble purpose of ensuring a perfect guide action and to obtainafluidtightness without having recourse to packings or specialdevices.

A rod 11 secured to the piston 10 or in one piece with the same, isarranged in the axis of the said piston and provided with acrank arm 12having an operating handle 13 and a boss 111.` On'the latter is secured,at right angles to the axis of the pump, a finger 15 which serves as aspindle for a roller 16, guided between the flanges of` a cam-slot 17formed in a sleeve 18 internally screw-threaded for screwing on thethreaded portion 4 of the armature. VThe shape and orientation of thecam-slot 17 are determinedaccording to the stroke adopted andvaccordingto the law of movement of the reciprocating displace.- ments of thepiston.

This law can obviously be ofpany kind for a medical pump usually`actuated by hand Thus, for greater simplicity, the flanges of thecamslot 17 are plane and inclined relatively to the axis of the pumpaccording to the stroke to beimparted'to the .piston10. The sleeve 18 issecured on the pump barrel so as to provide a space, as reduced aspossible between the bottom 2 and the piston when it is at the end .ofits stroke. Relating to the angular orientation or setting of the sleeve18 relatively to the pump barrel, it can be determined by referencemarks or by abutments for causing the ports 8 and-9 to coincide withgrooves 19 and 2O provided on the side surface of thev piston 10,according'to the required cycle of operation.

The grooves 19 and 20 of the piston 10 are -homologous curves ofthecam-slot 17.

rlhey open in the bottom of the piston and correspond, one to the inletport, the other to the delivery port.

The operation of the pump thus described may be reviewed as follows. If,for instance, it is desired to make an injection, the

suction nozzle 7 is connected throughA a pipe,

to the needle '(not shown), Whilst the delivery nozzle 6 receives a pipe(not shown) for discharging the pumped liquid. The

pump barrel being held'l in one hand, the.

plston is caused to Continuously rotate with the other Vhand by meansofthe crank;Y itV receives atthe same time reciprocating translations.During the downstroke (Fig. 4)` the groove 19 moves opposite the suctionport 8 and vthepump barrel fills up with the suckedv liquid. `At the endof the down stroke, the groovel9 ceases to be in contact i with the port8, and during the up stroke the Vgroove 20:1noves opposite thef-port 9through which is delivered the liquid'previously sucked. f After use,the pump can be rapidly taken apart. In fact, it suflicesto unscrew thesleeve 18 for separating the piston from the Y pump barrel and to veryVeasily effect the washing and sterilization lof these elements.

What I claim as my invention land desire to secure by Letters Patent isze i Y 1. In apiston pump for medical purpose Y of the valveless type, apump barrel, a rotating and reciprocating piston therein, a

hand crank upon the piston'for rotating thev same, a radial finger uponthe said crank,

la roller freely mounted upon the said finger,

two inclined flanges upon outer surface of Vthe pump barrel and formingguiding members for the roller placed between them.

2. In a piston pump for medical purposes of the valveless type, a pumpbarrel, having an inlet and an outlet in its side walls near its outerend,.a rotating and reciprocating piston in the barreha hand crankuponthe piston for rotating the same, a radial finger upon the saidcrank, a roller freely mount- V ed upon the said finger, a socket jatthe inner A Y end ofthe pump'barrel adjacent to the crank,

twoV inclined flanges upon the said socket for receiving betweenthemthev roller and to impart to the piston a reciprocating movement in thebarrel duringV the rotation of the crank, f and means for readilyconnectingor separating the said socket and the pump barrel.

u In testimony whereof I have signed this specification. Y I

CHARLES MAYER.

